PATCH to defer cpp_read_main_file and related changes

[Per Bothner]

Per Bothner wrote:
> DJ Delorie wrote:
> 
>>>     * c-lex.c (src_line):   Remove unneeded static variable.
>>
>> This patch broke -imacros :-(
>>
>> $ ./cc1 -quiet -imacros dj.h dj.c
>> <command line>:2: internal compiler error: Segmentation fault
> 
> I had a patch for this, but it appears to cause many regressions.
> I'll look further for a solution ...

Actually the patche reduced the number of regressions (there were just a 
lot of unexpected failures), so I checked it in.  Here it is.
-- 
	--Per Bothner
per@bothner.com   http://per.bothner.com/

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